The ratkins, werewolves, lizardmen, Roushk, Bernard and Logan so far, the former 3 you can get them anytime, with their respective lures (Rodent, Wolf and Reptile), the latter requires specific events, for Roushk you lure him with reptile lures and then beat him phisically or sexually, for Logan/Bernard you only need to find them in the wolves' den then beat them in any way possible.